When it comes to luxury saloons, BMW's 7 Series has long been regarded as 'the ultimate driving machine', as the slogan goes. Can the all-new 2018 Audi A8 knock it off top spot as the best driver's car in the class? Matt Prior and Dan Prosser take the luxo-barges to one of Autocar's favourite Welsh B-roads to find out. Subscribe now: http://smarturl.it/autoca

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